| As is known to all,pavement skid resistance performance is an important indicator reflecting the safety of road traffic,but in the operation process,with the increase of time,pavement skid resistance performance inevitably appears different degree of attenuation,which not only seriously affects the safety and comfort of road driving,but also greatly increase road maintenance costs and shorten the service life of roads.In this paper,a large number of laboratory tests were conducted to explore the skid resistance performance evolution law of asphalt pavement,and the influencing factors and rules were explored from the perspective of materials.Moreover,a prediction model of skid resistance performance evolution of pavement was established based on the characteristics of mixture materials.Finally,a maintenance technology for effectively restoring the skid resistance of pavementSandblasting Fog Seal was proposed.Based on the principle of tire-pavement friction,the composition of skid resistance friction of asphalt pavement under dry and wet conditions was expounded,and the influence factors,test methods and evaluation methods of skid resistance of asphalt pavement were analyzed.In order to explore skid resistance performance evolution law of asphalt pavement,this research adopted the group independent research and development of Multiple Acceleration Abrasion Machine(MAAM)and Walking Friction Tester(WFT)from Mean Profile Depth(MPD),British Pendulum Number(BPN),and Walking Friction Coefficient(WFC)to explore the attenuation law of the skid-resistance performance of different aggregate types,different gradations,different nominal maximum particle sizes,different asphalt amounts,and different asphalt types,and revealed the mechanism of skid resistance of asphalt pavement performance decay,and based on the Asymptotic model y=Ae ^ Bx+C fitting analysis,Built the attenuation function of anti-skid performance of different asphalt pavement.In order to quantify the influence of material parameters on the pavement skid resistance performance attenuation parameters A(skid resistance attenuation number),B(skid resistance attenuation rate),A+C(initial skid resistance number)and C(final skid resistance number),this study used grey correlation analysis to explore the influence of rock types on the pavement skid resistance attenuation based on the three rock mechanical indexes and morphology parameters.In this paper,the influence of gradation and nominal maximum particle size on the attenuation of pavement skid resistance performance of more than ten different asphalt pavement panels was explored.Based on the skid-resistance durability of asphalt pavement,the key parameters of mixture gradation design,16mm and 9.5mm pass-rate difference Δ16mm-9.5mm(the maximum particle size is 16mm or 13mm)and 1.18mm and 0.15mm pass-rate difference Δ1.18mm-0.15mm were recommended.Based on the results of grey correlation analysis,the main influence factors were selected,and the least-square method was used to conduct multivariate linear fitting analysis on the skid resistance attenuation parameters of AC pavement,and the service life prediction model of the skid resistance of AC pavement was established based on the properties of mixture materials.In view of the problem that the skid-resistance of pavement is difficult to meet the basic traffic requirements after a certain period of time,and the general skid resistance maintenance technology is expensive and can not be implemented in time,this study proposed an effective resume pavement skid resistance of maintenance technology,sandblasting fog seal.And made deeply research on its material composition design,skid resistance recovery effect,etc.It is found that the sandblasting fog seal can significantly improve the micro stability of pavement texture,and has no obvious effect on macro texture.It can improve about 50%of the pavement skid resistance level and extend nearly 50%of the road service life.It has the advantages of low maintenance cost,convenient construction and effective improvement of skid resistance. |
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